Bar with negative stack

author(s): Torstein Hønsi

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>

<figure class="highcharts-figure">
    <div id="container"></div>
    <p class="highcharts-description">
        Bar chart showing Andorran population distribution by using a mirrored
        horizontal column chart with stacking and two x-axes.
    </p>
</figure>

CSS

body {
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        "Apple Color Emoji",
        "Segoe UI Emoji",
        "Segoe UI Symbol",
        sans-serif;
    background: var(--highcharts-background-color);
    color: var(--highcharts-neutral-color-100);
}

#container {
    height: 400px;
}

.highcharts-figure,
.highcharts-data-table table {
    min-width: 310px;
    max-width: 800px;
    margin: 1em auto;
}

.highcharts-data-table table {
    font-family: Verdana, sans-serif;
    border-collapse: collapse;
    border: 1px solid var(--highcharts-neutral-color-10, #e6e6e6);
    margin: 10px auto;
    text-align: center;
    width: 100%;
    max-width: 500px;
}

.highcharts-data-table caption {
    padding: 1em 0;
    font-size: 1.2em;
    color: var(--highcharts-neutral-color-60, #666);
}

.highcharts-data-table th {
    font-weight: 600;
    padding: 0.5em;
}

.highcharts-data-table td,
.highcharts-data-table th,
.highcharts-data-table caption {
    padding: 0.5em;
}

.highcharts-data-table thead tr,
.highcharts-data-table tbody tr:nth-child(even) {
    background: var(--highcharts-neutral-color-3, #f7f7f7);
}

.highcharts-description {
    background: light-dark(#f2f6f2, #323232);
    border-radius: 0 4px 4px 0;
    border-left: 2px solid light-dark(#1d6aff, #fff);
    font-size: 0.8rem;
    font-style: italic;
    padding: 8px 16px;
    margin: 2em 10px 1em;
}

JavaScript

// Custom template helper
Highcharts.Templating.helpers.abs = value => Math.abs(value);

// Age categories
const categories = [
    '0-4', '5-9', '10-14', '15-19', '20-24', '25-29', '30-34', '35-40', '40-45',
    '45-49', '50-54', '55-59', '60-64', '65-69', '70-74', '75-79', '80-84',
    '80+'
];

Highcharts.chart('container', {
    chart: {
        type: 'bar'
    },
    title: {
        text: 'Population pyramid for Andorra, 2023'
    },
    subtitle: {
        text: 'Source: <a ' +
            'href="https://countryeconomy.com/demography/population-structure/andorra"' +
            'target="_blank">countryeconomy.com</a>'
    },
    accessibility: {
        point: {
            valueDescriptionFormat: '{index}. Age {xDescription}, {value}%.'
        }
    },
    xAxis: [{
        categories: categories,
        reversed: false,
        labels: {
            step: 1
        },
        accessibility: {
            description: 'Age (male)'
        }
    }, { // mirror axis on right side
        opposite: true,
        reversed: false,
        categories: categories,
        linkedTo: 0,
        labels: {
            step: 1
        },
        accessibility: {
            description: 'Age (female)'
        }
    }],
    yAxis: {
        title: {
            text: null
        },
        labels: {
            format: '{abs value}%'
        },
        accessibility: {
            description: 'Percentage population',
            rangeDescription: 'Range: 0 to 5%'
        }
    },

    plotOptions: {
        series: {
            stacking: 'normal',
            borderRadius: '50%'
        }
    },

    tooltip: {
        format: '<b>{series.name}, age {point.category}</b><br/>' +
            'Population: {(abs point.y):.2f}%'
    },

    series: [{
        name: 'Male',
        data: [
            -1.38, -2.09, -2.45, -2.71, -2.97,
            -3.69, -4.04, -3.81, -4.19, -4.61,
            -4.56, -4.21, -3.53, -2.55, -1.82,
            -1.46, -0.78, -0.71
       ...